Naked Science Forum

Non Life Sciences => Chemistry => Topic started by: holly09 on 29/06/2009 20:37:54

Title: help with concentration of Al in mixed salt stock solution
Post by: holly09 on 29/06/2009 20:37:54
Hi all. I really need the answer to this question.
A stock solution of aluminium is to be prepared by dissolving 12346mg of Al2(SO4)3.18H2O in water and made up to 1000ml. What is the concentration of Al in this stock solution? The molecular weight of the compound is 666.4 and the atomic weight of Al is 26.98. From these I have worked out that there is 499.8 mg/l Al in the solution.
Is this correct or do I need to include something else in this calculation. Help [:(]
Title: help with concentration of Al in mixed salt stock solution
Post by: Bored chemist on 29/06/2009 21:19:43
Close.
You forgot to count the Aluminium atoms in the molecule.
Title: help with concentration of Al in mixed salt stock solution
Post by: holly09 on 29/06/2009 22:55:30
how do i do that [:-[] do i multiply by 2 giving me an almost 1000ppm solution?
Title: help with concentration of Al in mixed salt stock solution
Post by: Chemistry4me on 30/06/2009 06:17:56
Yes, that sounds right.
Title: help with concentration of Al in mixed salt stock solution
Post by: Jennifervn on 03/07/2009 04:53:08
Thanks for your post. It’s really useful  [O8)].
Spammy Spam, banned and blacklisted!
Title: help with concentration of Al in mixed salt stock solution
Post by: Chemistry4me on 03/07/2009 04:54:32
Yeah, and thanks for your hidden spam message  [O8)]